#pragma once

#include <iostream>
#include <string>
#include <strings.h>
#include <cstring>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <functional>
#include <unordered_map>
#include "Log.hpp"

using namespace std;
// using func_t = function<string(const string&)>;
typedef function<string(const string &, const string &, uint16_t)> func_t;

Log lg;

enum{
    SOCKET_ERR=1,
    BIND_ERR
};

uint16_t defaultport = 8080;
string defaultip = "0.0.0.0";
const int size = 1024;



string ExcuteCommand(const string &cmd)
{
    cout << "get a request cmd: " << cmd << endl;

    FILE *fp = popen(cmd.c_str(), "r");
    if(nullptr == fp)
    {
        perror("popen");
        return "error";
    }
    string ret;
    char buffer[4096];
    while(true)
    {
        char *tmp = fgets(buffer, sizeof(buffer), fp);
        if(tmp == nullptr) break;
        ret += buffer;
    }
    pclose(fp);

    return ret;
}

class UdpServer{
public:
    UdpServer(const uint16_t &port = defaultport, const string &ip = defaultip)
        :sockfd_(0), 
        port_(port), 
        ip_(ip),
        isrunning_(false)
    {}
    void Init()
    {
        // 1. 创建udp socket
        // 2. Udp 的socket是全双工的，允许被同时读写的
        sockfd_ = socket(AF_INET, SOCK_DGRAM, 0); // PF_INET
        if(sockfd_ < 0)
        {
            lg(Fatal, "socket create error, sockfd: %d", sockfd_);
            exit(SOCKET_ERR);
        }
        lg(Info, "socket create success, sockfd: %d", sockfd_);
        
        // 2. bind socket
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(port_); //需要保证我的端口号是网络字节序列，因为该端口号是要给对方发送的
        local.sin_addr.s_addr = inet_addr(ip_.c_str()); //1. string -> uint32_t 2. uint32_t必须是网络序列的 // ??
        // local.sin_addr.s_addr = htonl(INADDR_ANY);

        if(bind(sockfd_, (const struct sockaddr *)&local, sizeof(local)) < 0)
        {
            lg(Fatal, "bind error, errno: %d, err string: %s", errno, strerror(errno));
            exit(BIND_ERR);
        }
        lg(Info, "bind success, errno: %d, err string: %s", errno, strerror(errno));
    }
    
    // void CheckUser(const struct sockaddr_in &client, const string clientip, uint16_t clientport)
    // {
    //     auto iter = online_user_.find(clientip);
    //     if(iter == online_user_.end())
    //     {
    //         online_user_.insert({clientip, client});
    //         cout << "[" << clientip << ":" << clientport << "] add to online user." << endl;
    //     }
    // }

    // void Broadcast(const string &info, const string clientip, uint16_t clientport)
    // {
    //     for(const auto &user : online_user_)
    //     {
    //         string message = "[";
    //         message += clientip;
    //         message += ":";
    //         message += to_string(clientport);
    //         message += "]# ";
    //         message += info;
    //         socklen_t len = sizeof(user.second);
    //         sendto(sockfd_, message.c_str(), message.size(), 0, (struct sockaddr*)(&user.second), len);
    //     }
    // }

    void Run() // 对代码进行分层
    {
        isrunning_ = true;
        char inbuffer[size];
        string temp;
        while(isrunning_)
        {
            struct sockaddr_in client;
            socklen_t len = sizeof(client);
            ssize_t n = recvfrom(sockfd_, inbuffer, sizeof(inbuffer) - 1, 0, (struct sockaddr*)&client, &len);
            if(n < 0)
            {
                lg(Warning, "recvfrom error, errno: %d, err string: %s", errno, strerror(errno));
                continue;
            }
            
            // uint16_t clientport = ntohs(client.sin_port);
            // string clientip = inet_ntoa(client.sin_addr);
            // CheckUser(client, clientip, clientport);

            // string info = inbuffer;
            // Broadcast(info,clientip, clientport);

            inbuffer[n] = 0;//看成字符串
            temp = inbuffer;
            temp = ExcuteCommand(temp);
            cout<<temp<<endl;
            //ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
                      //const struct sockaddr *dest_addr, socklen_t addrlen);
            sendto(sockfd_,temp.c_str(),temp.size(),0,(struct sockaddr*)&client,len);//发送
        }
    }
    ~UdpServer()
    {
        if(sockfd_>0) close(sockfd_);
    }
private:
    int sockfd_;     // 网路文件描述符
    string ip_; // 任意地址bind 0
    uint16_t port_;  // 表明服务器进程的端口号
    bool isrunning_;
    //unordered_map<string, struct sockaddr_in> online_user_;
};